(CNN) — Members of the president’s party in Tunisia will quit the coalition government, the state-run news agency TAP reported Sunday.

The move threatens to worsen a political crisis, set off after an opposition leader was assassinated there last week.

The Congress for the Republic Party, which counts Tunisian President Moncef Marzouki among its ranks, has three ministers and two secretaries of state in the government, TAP reported.

The five officials will “continue to shoulder their responsibilities within their respective departments to avoid any administrative vacuum,” TAP said, citing Chokri Yacoub, a party leader.